Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation [Line Items]
Federal tax at 21% statutory rate	$ (16,415)	$ 8,523	$ 5,279
State income taxes, net of federal benefit(1)	(2,208)	1,839	773
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	(821)	(3,480)	(100)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	610	(1,466)	(1,612)
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	41	1,282	2,685
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	1,449	976	3,161
Federal benefit of NOL Carryback	(3,885)	0	0
Other, net	$ (2,424)	$ 325	$ 1,822
Federal statutory rate	21.00%	21.00%	21.00%
Income tax (benefit) expense	$ (7,730)	$ (15,859)	$ 9,259
Goodwill
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	8,297	0	0
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	7,620	0	0
Entity Classification Election [Member]
Effective Income Tax Rate Reconciliation [Line Items]
State income taxes, net of federal benefit(1)		900
Effective Income Tax Rate Reconciliation, Deduction, Amount	0	24,813	0
Foreign Derived Intangible Income Benefit [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Deduction, Amount	0	0	2,186
Equity awards granted to employees
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Deduction, Amount	209	482	910
Discontinued Operations, Disposed of by Sale [Member] | Foreign Derived Intangible Income Benefit [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Deduction, Amount		3,700
Compensation [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	215	891	347
Acquisition-related Costs [Member]
Effective Income Tax Rate Reconciliation [Line Items]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 0	$ 546	$ 0